Stoker-grate



(i.4 F. PATTERSON.

STOKER GRATE.

APPLICATION FILED Aue.13, 191e.

3 SHEETS-SHEET l.

Patented oct, 25, 1921.

mwntoz G. F. PATTERSON.

STOKER GRATE.

APPLICATION FILED AuG.I3, 19m. I 1,395,006, A Patented 0G13. 25, 1921.

3 SHEETS-SHEET 2.

G. F. PATTERSON.

STOKER GRATE. 'APPLICATION FILED Aucna. |918.

1,395,006, Patented Oct. 25, 1921.

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GEORGE F. PATTERSON, OF BALTIMORE, MARYLAND.

sToKER-GRATE.

Specification of Letters Patent.

VPatented Oct. 25, 1921.

vApplication filed August 13, 1918. Serial No. 249,617.

To all whom t may concern:

Be it known that I, GEORGE F. PArrnnsoN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Stoker-Grates, of which the following is a specication.

This invention relates to improvements in grates for furnaces and has particular reference to a Stoker grate in which the fuel may be fed along the grate to the end that a uniform distribution of the fuel may be attained and the fire maintained in accord?` ance with the heat units required.

The objects of the invention are to provide an improved Stoker grate in which all the stoker bars are formed in sections that are interchangeable and may be dropped into working position or lifted therefrom; in which the bearing bars and trunnions are Suiiiciently spaced below the grate surface to prevent burning out and are so related with respect to eachother that during the Stoking operationthe movement is a sliding one under the bed of coals and avoids the necessity of lifting the coal bed during the operation of stoking.

Other objects and advantages will become apparent from the following specification.

The invention is illustrated in the accompanying drawings, wherein,

Figure 1, shows a vertical longitudinal section through a furnace and illustrates my improved Stoker grate in side elevation.

Fig. 2 illustrates the same in top plan,- the Stoker-bar sections on one-half. of the grate being omitted to show the supporting and actuating devices for the Stoker-bar sections. c

Fig. 3,'shows an enlarged vertical longitudinal section through the lower end'ofthe Grate.

D F ig. 4, illustrates a cross-sectional detail through the same,-the section .being taken on thev lineV 4-4 of Fig. 3,loo-king, in the direction of the darts.. y

Fig. 5, shows in perspective a fragment oit-portion of the rest-baremployed near the lower end of thegrate. V

Fig. 6, illustrates one of the side bearing bars in side elevation.

Fig. 7, shows the same in top edge view.

Fig. 8, illustrates one of the Stoke-bar sections in perspective, and

Fig. 9, an end of the oscillating support in perspective.

Referring to the drawings b y numerals, 8 designates the front wall of the furnace 9 the side walls and l() the bridge wall thereof. The usual fuel-door openings 11, are provided in the front wall together with the ordinary plates 12, at the bottoms of said openings.

VIn the furnace chamber 13, and at opposite sides of the door openings 11, I provide inclined bearing bars 14, the upper ends of which are suitably secured at the inner side of the front wall and the lower ends of which bars are secured in the bridge wall 10. The precise number of these bearing bars is determined by the size of the furnace and the number of grates to be employed, but there are two bearing bars for each grate.

Each bearing bar 14, see particularly Figs. 8, 4, 6,v and 7 of the drawings, is provided along its inner side with a series of concave sockets or bearing recesses 15, which are uniformly spaced and which are open at their upper sides. Near the lower end, each bearing bar also has a concave bearing lug 16,l at its inner side and at the lower end and adjacent to the inner side of the bridge wall 10, each bearing bar 14, iS provided with a bearing recess 17,' at the inner side of its upper edge.

Between each pair of bearing-bars I' provide aY Series of Oscillating supports. These supports in the present instance, comprise a lower horizontal bar 18; an upper horizontal bar 19,'arms 20, which connect the two bars and a trunnion 21, at each end of the lower bar which trunnions seat in bearing recesses 15, on the inner sides of the bearing bars.`

It'is thus to be understood that the upper horizontal bars 19, are sustained in an elevated position with'respect to the bearing recesses 15, and are So supported as to be capable/.0f oscillating between the spacedapart rbearing-bars. It is also to be noted that the trunnions 21, of the oscillating supports may simply be dropped down into the the latter is thereby pivotally sustained between the rigid grate bar 22, and the bridgewall, the edge of the dum grate adjacent to the rigid bar having the free swinging edge of the dump grate.

A lug 40, is provided on the bottomof the dump grate and the upper end of a link 41, is pivoted to said bottom lug while the lower end of said link is pivoted to the upper end of a second link 42. Link 42, has its lower end pivotally connected to a bracket plate 43, which is rigidly mounted or bolted in the bottom of the furnace.

An operating rod 44, has its inner end pivotally connected to link 41, and extends all the way under the grate to and through the front wall of the furnace and the projecting end of this rod 44, has an eye 45, by which it may be conveniently grasped by the hand for longitudinal movement.

By reference to Fig. 1, of the drawing it will be seen that the two links 41, 42, form a toggle so that when the grate is in the lowered or dumping position, as shown in broken lines the link 41, will have a vertical position while link 42, will assume a horizontal position. To raise the grate from the dotted to the full line position the rod 44, will be drawn outwardly and during the initial or first part of this movement the link 41, will swing forward lifting the free edge of the grate until it assumes an inclined position but with the link 41, at right angles to the dump grate surface,-the link 42, remaining horizontal during this preliminary movement. The further outward movement of the rod 44, will then lift the link 42, and swing the latter from the horizontal to an upright position carrying the grate up with it,-the operation of the links being that of a toggle which movement, in practice is found to be effected with comparative ease.

The outer end of the rod 44, is preferably provided on its under side with a vseries of teeth or notches 46, whereby to engage thev bar with a plate 47, on the front of the furnace so the rod and the dump grate may be held in any desired position.

By reference, particularly to Figs, 4 and 9, of the drawings, it will be noted that each upper bar 19, of the several oscillating supports is provided at each end with a stop lug 48, which latter project upwardly s0 as to engage the endmost Stoke-bar sections and prevents lateral shifting of the sections along the bar.

Having described my invention, what I claim is,-

1. In a furnace grate, the combination with two spaced-apart bearing bars each having vertical inner and outer faces and adjacent to the lower edge of the inner vertical face, each of said bars being provided with a series of upwardly-opening bearings which latter are considerably below the upper edge of the bearing bars, of a series of oscillating supports each having a lower horizontal bar with trunnions that seat in said bearings in the bearing bars and an upper horizontal bar that has position below the upper edge of and is between the two spaced bearing bars; a plurality of stokerbar sections each section having a plurality of short bars with slots between the latter, and also having a concave bearing recess extending continuously in a direction crosswise of its bars and at the under side thereof to seat on the upper horizontal bar of an oscillating support whereby to completely cover and protect the said upper horizontal bar which supports it, and means for rocking said supports.

2. A Stoker-bar section for grates comprising a plurality of short bars with slots between the latter and said section having a concave bearing recess extending continuously in a direction crosswise of the bars and at the under side thereof.

3. A Stoker-bar section for grates comprising a plurality of short bars with slots between the latter and said section having a continuous concave bearing recess extending in a direction cross-wise of the bars and at the under side thereof and said short bars being connected in a cross-wise direction by a cross-bar.

4. A Stoker-bar section for grates comprising a plurality of short bars with slots between the latter said section having integral arched connections between the bars and the under side of said arched connections having a continuous concave bearing surface from one side of the section to the other which bearing surface opens downwardly.

In testimony whereof I aiiiX my signature.

GEORGE F. PATTERSON. 

